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reactingFoam problem

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Old   May 22, 2018, 03:43
Post reactingFoam problem
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Jung da yoon
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I tried the Sandia d tutorial by using 'reactingFoam'.
I found that reactingFoam cannot solve 'radiation heat transfer'.
But qr, G were derived as a result.

After testing the tutorial, I checked the radiationProperties in constant directory.

Sandia d tutorial uses p1 model and radiation model.

I can't know why reactingFoam can't solve the radiation heat transfer although the tutorial uses p1 radiation model.

Any answer is okay.
Thank you
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Old   January 8, 2019, 17:51
Default Mass conservation issue in Sandia flame Tutorial // OF6 reactingFoam
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Jeff
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Hi
I have been studying this tutorial wich is quite sophisticated.
I just added mass flow calculation at all inlet and outlet in the classical way ( function Object in controlDict that sum phi on each patch).
.
My finding is that there is important mass conservation issue:

1 at iteration 5000 which is the maximum iteration in the original controlDict file, the following inlet and outlet mass give:
Code:
Expression patchMassFlow on inletAir:  sum=-0.07559693854
Expression patchMassFlow on inletCH4:  sum=-0.002137413754
Expression patchMassFlow on inletPilot:  sum=-0.0004322914778

Expression patchMassFlow on outlet:  sum=0.102603314
Adding the inlet mass gives 78.2g In while at the same time 102g are going out

The solution is clearly not steady by far at this point.
OK reactingFoam is a transient solver so maybe running it longer will help:

Increasing the number of iteration dont help

the outlet mass fluctuates (a lot) but never stabilise close to the inlet mass and the solver crashes at iteration number 14644. ( and the inlet mass remains constant of courses)

So a steady state solution is never reached in this tutorial.

I will be working on the side on this tutorial as I have related cases I am interrested in (but these cases have mass conservation...) and I will update this post if I can improve the situation.
In the meantime if one of the author of this Tutorial ( or someone else for that matter) could have a look at it, It will be amazing.

Sandia flame D is a well known benchmark problem and this is a very sophisticated tutorial..

JF

Last edited by jf_vt; January 8, 2019 at 18:11. Reason: better title
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